Derivative and Hedging Activities Derivative and Hedging Activities - Balance Sheet Location (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Asset at Fair Value	$ 13	$ 329
Foreign Currency Cash Flow Hedge Liability at Fair Value	281	0
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	100	12
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	90	7
Prepaid Expenses and Other Current Assets [Member] | Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Asset at Fair Value	13	329
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	100	12
Accrued Liabilities [Member] | Forward Contracts [Member]
Derivative [Line Items]
Derivative Asset, Current	113	341
Derivative Liability, Current	371	7
Accrued Liabilities [Member] | Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	90	7
Accrued Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Forward Contracts [Member]
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	$ 281	$ 0